Add support for partials and path segments for Handlebars.

This introduces support for some missing features to the Handlebars lexer:
Partials and path segments. Partials mostly appeared to work before, but the
`>` in `{{> ... }}` would appear as a syntax error, as could other
components of the partial. This change introduces support for:

* Standard partials: `{{> partialName}}`
* Partials with parameters: `{{> partialName varname="value"}}`
* Ddynamic partials: `{{> (partialFunc)}}`
* Ddynamic partials with lookups: `{{> (lookup ../path "partialName")}}`
* Partial blocks: `{{> @partial-block}}`
* Inline partials: `{{#*inline}}..{{/inline}}`

It also introduces support for path segments, which can reference content in
the current context or in a parent context. For instance, `this.name`,
`this/name`, `./name`, `../name`, `this/name`, etc. These are all now tracked
as variables.

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/test_php.py b/tests/test_php.py
new file mode 100644
index 00000000..050ca70d
--- /dev/null
+++ b/tests/test_php.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+"""
+    PHP Tests
+    ~~~~~~~~~
+
+    :copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import unittest
+
+from pygments.lexers import PhpLexer
+from pygments.token import Token
+
+
+class PhpTest(unittest.TestCase):
+    def setUp(self):
+        self.lexer = PhpLexer()
+
+    def testStringEscapingRun(self):
+        fragment = '<?php $x="{\\""; ?>\n'
+        tokens = [
+            (Token.Comment.Preproc, '<?php'),
+            (Token.Text, ' '),
+            (Token.Name.Variable, '$x'),
+            (Token.Operator, '='),
+            (Token.Literal.String.Double, '"'),
+            (Token.Literal.String.Double, '{'),
+            (Token.Literal.String.Escape, '\\"'),
+            (Token.Literal.String.Double, '"'),
+            (Token.Punctuation, ';'),
+            (Token.Text, ' '),
+            (Token.Comment.Preproc, '?>'),
+            (Token.Other, '\n'),
+        ]
+        self.assertEqual(tokens, list(self.lexer.get_tokens(fragment)))